I have just replaced the factory radio in my 1997 legacy s/w with a new headunit. After connecting the speakers/12v continous lead/acc and ground wire I am left with 3 wires. I traced the green/yellow as the power antenna and hooked this up accordingly. The 2 leftover wires from the subaru loom are a thin black and a white/green, i'm not sure what these are used for.

 

My problem is the power antenna does not work now. The motor makes a noise but it does not go up or down.

 

Any ideas?

 

Thanks

Sounds like the MAST needs to be replaced. I had similar problem and replaced only the mast. Make sure you get a genuine Subaru MAST.

I would check the amount of voltage that is going to the motor while it is running and make sure it is at least 12 volts. If it is, and the motor ground is ok, then a new antenna may be needed or the original one repaired. It may be stuck or the coiled line is broken inside it. This is a common failure.